高拉速时连铸结晶器内钢液湍流场及其电磁控制研究

Study on Turbulent Flow Field of Liquid Steel and Its Electromagnetic Control in Continuous Casting Mold at High Casting Speed

利用数学模型结合低熔点金属合金模型试验研究全幅二段恒稳磁场控制结晶器内气液两相流场和夹杂物粒子的运动轨迹。结果表明,水口喷吹氩气结合施加恒稳磁场的作用,同时达到控制结晶器内弯月面波动、获得活塞流和抑制后凝固区偏析的目的。氩气喷吹和磁场共同作用既能保持液面稳定又能避免凝结发生。吹入氩气能增加夹杂物的去除率。施加磁场时,夹杂物运动速度明显降低,夹杂物的富集率降低。

Mathematical model and modeling experimental result on low melting point metal were used to study gas/liquid two phase flow field and trajectories of non-metallic inclusions in the mold under the effect of two zone magnetic fields. Results showed that the combination of argon bubbling and magnetic field can control probably the meniscus fluctuation and obtain the plug flow and suppress the macro segregation in end region of solidification at the same time. It was found that the reasonable fluctuation of meniscus is formed when both of argon bubbling and magnetic field are used together. Argon bubbling increases the inclusion removal rate. By applying the magnetic field, the average velocity and agglomeration rate of inclusions are decreased significantly.